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Author Topic: AntiSierpinski  (Read 5730 times)
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Karl131058
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« on: June 27, 2008, 05:26:39 PM »

Hi people,
me again, and there is this polish mathematician in the subject line, too.
This time it's 2d, even simpler, and NO theory question.
Sierpinskis triangle is defined by "ifs" :
take three copies, halve the size, and move them towards the corners of a triangle.

For reasons I can't remember any more (and it was only the beginning of april, talk about loss of memory here) I changed that into:
take three copies, halve the size, rotate n degrees, and move them towards the corners of a triangle.

When n is 0, 120, 240 degrees the well known figure appears!
For n = 60, 180, 300 there is some snowflaky thingie looking like the attached picture.
I had found one or two instances of that thing on the net - can't seem to find it again, but it was only shown, not given a name.
Since for any other angles than those mentioned the result seem to be disconnected (see second attachment, tiny animated gif), you got exactly two connected sets in that series: sierpinski triangle and "TheFlake".

Does anybody know if "TheFlake" has been given an official name?

Thank you for your time
Karl



* final.png (13.42 KB, 500x500 - viewed 904 times.)

* SierpAnim0.gif (74.76 KB, 320x240 - viewed 881 times.)
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stigomaster
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« Reply #1 on: July 23, 2009, 02:25:46 PM »

That gif looks a lot like rotating a transform in a Apophysis Sierpinski Gasket
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Cyclops
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« Reply #2 on: November 28, 2009, 06:08:49 PM »

Fascintaing and beautiful! A snowflake!
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Sensitively dependant on initial conditions
Nahee_Enterprises
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« Reply #3 on: December 30, 2009, 01:32:02 AM »

....I changed that into:
take three copies, halve the size, rotate n degrees,
and move them towards the corners of a triangle.
   .........
Does anybody know if "TheFlake" has been given an
official name?

Very similar to a Sierpinski Pentagon:
  http://ecademy.agnesscott.edu/~lriddle/ifs/pentagon/pentagon.htm
or a Durer's Pentagon:
  http://ecademy.agnesscott.edu/~lriddle/ifs/pentagon/Durer.htm

And I have seen Koch Snowflakes that are also very similar.
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fractracer
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« Reply #4 on: April 04, 2010, 06:25:56 AM »

Sierpinski to AntiSierpinski in Fractracer ("Triangle Rotate" sample)


* triangle_rotate.png (83.6 KB, 320x240 - viewed 643 times.)

* triangle_rotate2.png (61.12 KB, 320x240 - viewed 687 times.)
« Last Edit: September 26, 2010, 12:40:41 PM by fractracer » Logged
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